📊 Non Destructive Testing and Evaluation
Q. When a longitudinal wave sound beam passes through an acoustic interface at some angle other than zero degrees:
  • (A) Surface waves are generated
  • (B) Plate waves are generated
  • (C) Reflection, refraction and mode conversion occur
  • (D) The first critical angle is reached
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✅ Correct Answer: (C) Reflection, refraction and mode conversion occur

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